Someone my umbrella. It’s wet and it was wet in the last few days.A. was usingB. must hav

问题补充：

Someone my umbrella. It’s wet and it was wet in the last few days.

A. was using

B. must have used

C. has been using

D. has used

答案：

A. was using

B. must have used

(答案→)C. has been using

D. has used

解析：句意：有人一直在用我的伞，因为它现在时湿的，在过去的几天里也一直是湿的。过去进行时表示过去正在进行的动作，很显然没有提到现在不符合语境；must have used表示过去一定做过某事；也没有提到现在的事情，不符合语境；has used表示过去的动作对现在造成的影响或结果，很显然这个不符合语境；现在完成进行时表示动作从过去开始一直持续到现在的动作；伞在过去被人用过，到现在还有人用，这正好符合语境，故选C。